Well, I haven't answered a RMT in a while, so let's try one :)
This is good but the only thing is, if you're going to use that Focus Sash then the 252 HP EV's won't really do anything. IF you're going to count on the EV's for bulk then the Focus Sash won't do anything. Just what I think. IMO I would switch the Focus Sash for Leftovers or have the EVs like this: 4 HP / 252 SpA / 252 Spe or something similiar. If you prefer your way that's fine.
Perfect <3 I use Jolly though for some extra speed to outspeed other Sharpedo's but Adamant is cool.
Like Mike said, use Tinted Lens. Also, Sleep Powder is something to consider because Venomoth isn't going to survive a whole lot tbh unless you Quiver Dance and Baton Pass after the first round, so sleep will be extremely helpful. Other than that this is good.
Something to consider is Toxic for T-Bolt. That way coverage is great and Pory'll last longer. Toxic is fine though. And everything else is a boss.
Try some speed EV's on this guy. Maybe have the spread like this? 4 HP / 252 Atk / 252 Spe
rest looks fine